Lib = {}
Lib.foo = function (x,y) return x+y end
Lib.goo = function (x,y) return x-y end

print(Lib.foo(1,2))

---声明递归函数的时候

local fact 
fact = function (n)
	if n ==0 then
		return 1
	else
		return n*fact(n-1)
	end
end

print(fact(5))
